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They are the same series of card but they both have differences. One is 512MB in size where as the other is 128MB. One is also PCI-e and the other is AGP. The one at EBay is the superior card however, depending on the type of computer you have, you may not be able to use it. Older PC's use AGP whereas newer ones use PCI-e and they are are not compatible with each other.
I just bought a e-Geforce 8800 GTS Superclocked for $320 and I love it I have been playing Lost Planet on full settings and it's amazing but that's just me but looks like you just need a basic card haha
To be honest the CompUSA card is better (although no longer in stock there). It has more RAM (256 MB vs 128 MB). However if your looking to spend in the range of $50-$100 I would suggest looking into the 7600GS and other 7 series cards. What are you planning to do with this card? What game and/or applications do you wish to run?